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Nitric acid(HNO3) is a strong oxidising agent. TheHydrogengas produced during itsreactionwithmetalgets oxidised to H2O, henceno hydrogengas is produced. Instead it evolvesnitricoxides such as NO2,NOetc.

Egg shellis made of calcium carbonate. We know that when calcium carbonate reacts withnitric acid, it gives carbon dioxide, calcium nitrate and water. Same reactionhappens when nitric acidis poured overegg shell.CaCO3 + 2HNO3 → Ca(NO3 )2 + CO2 + H2O

another wayFirst you have to makeBenzene diazonium clorideby addingNaNo3andHCl below 10 °c .

Then addwaterandboilit

Then you can formbenzyl alchol :)

1.

Concentrated nitric acid renders aluminium passive byforming a protective oxide layer on the surface. But dilute nitric acid dissolves themetal:Al + 4 HNO3→ Al3++ 3 NO3−+ NO ↑ + 2 H2O

Cesiumis the most electropositive of the stable elements.

no. of electron in its outer most orbit is 1

Ans: Option (1) Benzyl bromide has the weakest carbon-halogen bond.

Reason: After the loss of bromide ion, the cation (benzyl) is stabilised by resonance. Hence, C-Br bond becomes weakest.

When we treat ethyl bromide with lead sodium alloy we get tetra ethyl lead (TEL)

4NaPb + 4 CH3CH2Br → ( CH3CH2)4Pb + 4NaCl + 3 Pb

This TEL is use in automobiles to increase their efficiency and performance.

Thank you

Cs as it is present in group 1 and group 1 are highly electropositive elements

Matter is anything that has mass and takes up space. At a minimum, matter requires at least one subatomic particle, although most matter consists of atoms.

option (b) is correct.

Isotopes are atoms with the same number of protons, but different numbers of neutrons. In other words, they have different atomic weights. Isotopes are different forms of a single element.

Isotope Example:Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons (both with 6 protons). Carbon-12 is a stable isotope, while carbon-14 is a radioactive isotope (radioisotope).

option (a)

option D is the correct answer

For an element the equivalent weight is the quantity that combines with or replaces 1.00797 grams (g) of hydrogen or 7.9997 g of oxygen; or, the weight of an element that is liberated in an electrolysis (chemical reaction caused by an electric current) by the passage of 96,500 coulombs of electricity.

Static energy is the answer.

decreasing is the correct answer

decreasing is the correct answer because the energy reduces while the shell moves away from the nucleus

I think decreasing energy is the correct answer because s orbitals are the closest to nucleus and posses more energy as compared to p and z orbitalsso I think decreasing energy should be the answer

decreasing energy is the right answer for this question

as the energy will decreases due to because opposite reaction takes place when both move away from

a) increasing is correct answer

Neonhas two shells, both of which are completely filled with electrons (2 electrons in K shell and 8 electrons in L shell).

<>The maximum no. of electrons present in a shell is given by the formula2n² ( n is shell number).

<>The maximum number of electrons that can be accommodated outermost orbit is 8.

(iii)Electrons are not accommodated in a given shell, unless the inner shells are filled.

The element X with atomic no: 17 is Chlorine.No : of protons = 17No : of electrons = 17

Electronic Configuration = 2 , 8 , 7

The element X with atomic no: 16 is Sulphur.

No : of protons = 16No : of electrons = 16

Electronic Configuration = 2 , 8 , 6

Faraday's law of electrolysis are related to the equivalent mass of the electrolyte.

but how can write that mass of oxygen is 32?

Oxygen has 8 protons and eight neutrons, so it's molecular mass is 16u. As the Periodic table shows, the atomic mass of O is just slightly less than 16, so round off to 16. The oxygen molecule is O2, so it's molecular mass is 2 X 16 = 32.

1 is the correct answer

[Cr(NH3)6]3+

L=6

n=1

o. no. of Cr= x

x+6 x 0= +3

x= +3

EAN= Z-x+2nl

=24-3+2 x 1 x 6

=21+12

EAN= 33

how did you 2×1×6?????

is chlorine electron not counted in EAN?

[Cr(NH3)6)]Cl3EAN=At.no-o.s.+2×C.N =24-3+2×6 =33

thank you

Option- D is right

answer (d) is right option

agar right hai to ek like to banta hai

4) is the correct answer

(4) is a correct answer

in 300g sample has 60gm SO3. so for 100gm , so3 will be (60/300)*(100) = 20gm therefore the labelling % of oleum will be ( 100+20) % = 120%

this is the standard formula

Answers :--1) 22.4 L2) 7.466 L

The contact process is the current method of producingsulfuric acidin the high concentrations needed for industrial processes. Platinum used to be the catalyst for this reaction; however, as it is susceptible to reacting with arsenic impurities in the sulfur feedstock, vanadium(V) oxide (V2O5) is now preferred.Oleumisproduced in the contact process, where sulfur is oxidized to sulfur trioxide which is subsequently dissolved in concentrated sulfuric acid. Sulfuric acid itself is regenerated by dilution of part of theoleum.

It forms hydrogen fluoride and calcium sulphate.

CaF2 + H2SO4 → CaSO4 + 2HF

(1) the gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size(2) the molecules undergo perfectly elastic collisions (no energy loss) with each other and with the walls of the container, but otherwise do not interact(3) the transfer of kinetic energy between molecules is heat. These simplifying assumptions bring the characteristics of gases within the range of mathematical treatment.(4) The size of the container is much larger than the size of the molecules.(5) The interaction between the molecule is negligible.

thnkuu

Aphysical changeis anychangein matter thatinvolvesthe substance going from onephysicalstate to another.

Examples ofPhysical changes: 1. Ice meltinginvolvesachangefrom a solid to a liquid and the substances maintain the properties of water because the molecules never change

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1)Solids and liquids have very little free space between particles. So they are not easily compressible. ... Gases, on the other hand, are easily compressible. They have a lot of free space between particles.2)Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.3)A gas and a liquid will change shape to fit the shape of their container. A gas will change volume to fit the volume of the container. In general, solids are denser than liquids, which are denser than gases. . The particles in the solid are touching with very little space between them

Theanomalous expansion of water helpspreserve aquatic life during very cold weather. ... A circulation is thus set up until the entirewaterin the pond reaches its maximum density at 4°C. If the temperature falls further, the top layer expands and remains on the top till it freezes

a. Colloidal Solution is a heterogeneous mixture in which particle size of substance is intermediate of true solution and suspension i.e. between 1-1000 nm.b. Colloids solutions are heterogenous in nature and always consist of at least two phases:thedispersed phaseand thedispersion medium.

Dispersed Phase:It is the substance present in small proportion and consists ofparticles of colloids size (1 to 100 nm).

Dispersion Medium:It is the medium in which the colloids particles are dispersed.

Gandhiji regarded the state as

4 part is the answer

2part is answer because when s have 2electron then p have take 6 for full fill there self

4 is the right answer.

the 2option is the right answer

it's answer is 4. ns2np5

4th one the correct optio.

4 is the correct answer that is F(Fluorine)

Acolloidal solution, sometimes known as acolloidalsuspension, is asolutionin which a material is evenly suspended in a liquid. In other words, acolloidis a microscopically small substance that is equally dispersed throughout another material.

A colloid is a type of particle intermediate in size between amoleculeand the type of particles we normally think of, which are visible to the nakedeye. Colloidal particles are usually from 1 to 1,000 nanometers in diameter.

When a colloid is placed inwater, it forms a mixture which is similar in some ways to asolution, and similar in some ways to a suspension. Like a solution, the particles never settle to the bottom of the container. Like a suspension, the dispersion is cloudy.

Brass is a solution of Molten Cu in Molten Zn.

option b)Galena, also calledleadglance, is the natural mineral form oflead(II) sulfide. It is the most important ore ofleadand an important source ofsilver. Galena is one of the most abundant and widely distributedsulfide minerals. It crystallizes in the cubic crystal system often showingoctahedralforms.

option b)Galena, also calledleadglance, is the natural mineral form oflead(II) sulfide. It is the most important ore ofleadand an important source ofsilver. Galena is one of the most abundant and widely distributedsulfide minerals. It crystallizes in the cubic crystal system often showingoctahedralforms.

Discount = 15% of 1250= (15/100)*1250= ₹ 187.5

Selling price = Marked price - Discount= 1250-187.5= ₹ 1062.5

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i. Nitrogen is the seventh element with a total of 7 electrons. In writing the electron configuration for nitrogen the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for N goes in the 2s orbital. The remaining three electrons will go in the 2p orbital. Therefore the N electron configuration will be 1s22s22p3.

ii. Oxygen is the eighth element with a total of 8 electrons. In writing the electron configuration for oxygen the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for O go in the 2s orbital. The remaining four electrons will go in the 2p orbital. Therefore the O electron configuration will be 1s22s22p4.

iii. In writing the electron configuration for Chlorine the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Chlorine go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the remaining five electrons. Therefore the Chlorine electron configuration will be 1s22s22p63s23p5.

Mn has an atomic number of 25. Simply use this information to obtain its electronic configuration. Mn:1s^22s^22p^63s^23p^64s^23d^5or simply[Ar]4s^23d^5.

The electronic configuration of iron (for example) is1s2 2s2 2p6 3s2 3p6 4s2 3d6 , and it is abbreviated form [Ar] 4s2 3d6

1.506×10²² is the correct answer of the given question